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题目：
单选题
A位于骨盆中央，坐骨棘水平以下
B成年妇女子宫长9～10cm
C容积约为10ml
D非孕期子宫峡部为1cm
E子宫底与子宫颈相接处为峡部
答案：
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焊机的保护接地或保护接零系统不牢，会导致（）触电事故
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苗族的代表乐器是（）。
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射线检测技术与其他常用的无损检测技术相比，对微小裂纹的检测灵敏度较高。()
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下列观点中，属于二因素论的有（）。
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（）主要用于网络论坛、网络社区以及博客的管理。
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Shopping habits in the United States have changed greatly in the last quarter of the 20th century. （1） in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was （2） on both sides with many （3） businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. （4）,some shops offered （5） .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. （6） in the 1950s, a change began to （7） .Too many automobiles had crowded into Main Street （8） too few parking places were （9） shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces （10） the city limits. Open space is what their car-driving customers needed. And open space is what they got （11） the first shopping centre was built. Shopping centres, or rather malls, （12） as a collection of small new stores （13） crowded city centres. 14 by hundreds of free parking space, customers were drawn away from （14） areas to outlying malls. And the growing （16） of shopping centres led （17） to the building of bigger and betterstocked stores. （18） the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the （19） of one stop shopping, malls were transformed into landscaped parks, （20）benches, fountains, and outdoor entertainment. 请在17处填上正确答案（）
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制动梁滚子轴由外向内25mm处测量，直径磨耗大于（）时须更换。